Ok. Wild theory. Here it goes.
In numerology the numbers 1-9 are used as well as the double digit (master) numbers 11,22,33 and so on. I think that finding a dime could signify a
new beginning.
In numerology you take the numbers down as far as they go, so 10 would be 1+0=1. The end of the single digit cycle, and the beginning of the double
digit cycle. It's a perfect number. A perfect balance of positive and negative. The Yin and Yang of the number world.
So. Take finding dimes as a sign of change (quite literally).

Hope this helped.